Cardiac risk is central, not peripheral.
Ibogaine has been associated with QT prolongation, a change in cardiac electrical timing that can increase the risk of dangerous arrhythmias. The National Library of Medicine’s overview of long QT syndrome describes why prolonged QT intervals deserve clinical attention, especially where medicines or health conditions may compound risk.
Published case reports and reviews have described serious cardiac events, including fatal events, in connection with ibogaine exposure. Risk can be shaped by pre-existing heart disease, electrolyte abnormalities, dehydration, dose uncertainty, and medicines that affect cardiac rhythm. The FDA’s discussion of medication-associated abnormal heart rhythms illustrates the broader clinical concern around QT-prolonging drugs and interacting vulnerabilities.
The broader discussion of subjective ibogaine experiences can help separate reported feelings from safety conclusions: people may describe a vivid or inwardly focused state while still facing risks they cannot reliably perceive themselves.